/**
 * Flatten screenshot + annotations into a single PNG blob.
 * Uses an offscreen canvas at the original screenshot dimensions.
 */
import type { Annotation } from './annotation-types.js';
/**
 * Flatten annotations onto a screenshot blob, producing a new PNG blob.
 *
 * 1. Create offscreen canvas at original screenshot dimensions
 * 2. Load screenshot blob as Image via URL.createObjectURL
 * 3. drawImage onto canvas
 * 4. renderAll annotations on top
 * 5. canvasToBlob → return PNG blob
 * 6. Revoke temporary object URL
 */
export declare function flattenAnnotations(screenshotBlob: Blob, annotations: readonly Annotation[], width: number, height: number): Promise<Blob>;
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